Effect of CaCO3 Doping on Growth Behavior of Type Ⅰb Diamond along Different Crystal Faces

Abstract

Abstract: It is of great academic value to study the influence of carbonate doping on the growth behavior of synthetic diamond crystals. In this paper, CaCO₃ was doped into the carbon source in the diamond synthesis cavity at different ratios using the temperature gradient method at high pressure and high temperature (HPHT). The purpose of the study is to investigate the effect of CaCO₃ doping on the growth behavior of diamond along the (100) or (111) crystal plane, respectively. The crystal morphology of doped synthetic diamonds was studied by optical microscopy. The results show that with the increase of the CaCO₃ content, the crystal shape of diamond growing along the (100) plane change from tower to plate accompanied by crack crystal or crystals stock. The color of the crystal becomes lighter and then darker, and the inclusions appear in diamond. Besides, the crystal shape of diamond growing along (111) surface gradually changes from plate to tower accompanied by crack and twin crystals phenomena. With the increase of the CaCO₃ content, the color of diamond crystals gradually becomes darker, and more inclusions appear in diamond. The Raman spectroscopy results show that with the increase of CaCO₃ content, the Raman peak position shifts of doped diamond growing along (100) or (111) plane increase, and the full width at half maximum (FWHM) becomes larger. This indicates that the doping of CaCO₃ increases crystal lattice distortion and internal stress of diamond. In this paper, the causes for the effect of CaCO₃ doping on the crystal shape, color, internal quality and other behaviors of the diamond growing along the two different faces were analyzed, which lays the foundation for the subsequent study of this topic.

Key words: type Ⅰb diamond, doping, CaCO₃, temperature gradient method, crystal growth, HPHT, lattice distortion

CLC Number:

TQ163

CHEN Jiaxi, ZHANG Xiyun, LI Shangsheng, GUO Mingming, HU Meihua, SU Taichao, HUANG Guofeng, LI Zhanchang, ZHOU Zhenxiang, NIE Yuan, WANG Mengzhao, ZHOU Xubiao. Effect of CaCO₃ Doping on Growth Behavior of Type Ⅰb Diamond along Different Crystal Faces[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(11): 2053-2059.

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Effect of CaCO₃ Doping on Growth Behavior of Type Ⅰb Diamond along Different Crystal Faces

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